--- a/C/7zip/Compress/LZMA_Lib/makefile
+++ b/C/7zip/Compress/LZMA_Lib/makefile
@@ -2,7 +2,7 @@ PROG = liblzma.a
 CXX = g++ -O3 -Wall
 AR = ar
 RM = rm -f
-CFLAGS = -c  -I ../../../
+CFLAGS += -c  -I ../../../
 
 OBJS = \
   ZLib.o \
